Originally Posted by muddy93
you have that backwards. The crankshaft is the one that turns faster.
Ah, thank you! I always have trouble remembering which duplicates.
The thing that helps me remember and may help the OP understand as well:
The cam shaft does one rotation because each cam lobe has a unique task, i.e. opening a valve or closing a valve, and only performs that function once per camshaft rotation.
The crankshaft, however, rotates twice per revolution of the camshaft because each cylinder has to cycle twice, once for compression/ignition and once for exhaust/intake, before the camshaft is done performing all valve opening/closings.